If you love Reubens like I do, you will absolutely love this dip.
Heating this dip requires a precise two-hour window in a small 1 1/2 quart slow cooker to ensure the dairy fats render smoothly without separating.
Serve this warm dip immediately with dense rye bread or sturdy snack crackers that will not break under thick loads. Leftovers keep in an airtight container in the refrigerator for up to three days.